Conjugate Heat Transfer Analysis on a graphics card.
AIM: To perform CHT analysis on Graphic card.
PROCEDURE:
Geometry:
Geometry details:
Processor Fins Base Enclosure
Meshing:
Baseline setup:
Element size = 10.289 mm Number of nodes = 15922, Number of elements = 84873
Fluent setup:
Simulation type: Steady state simulation
Solver: Pressure based , Turbulance model : K-epsilon turbulance model with standard wall functions
Materials: Fins : Aluminimum (solid), Base : Fr-4 (solid), Processor: Silicon (solid), Enclosure: Air (fluid)
RESULTS:
Residuals:
Temperature contour cut plane:
Temperature contour:
Temperature contour processor:
Velocity contour:
Wall heat transfer coeffcient:
Refined setup
We have refined the mesh using body sizing option for different components of graphic card
Default element size = 2mm
Fin body sizing = 0.5mm
Processor body sizing = 0.5mm
Base body sizing = 1mm
Number of Nodes = 61,983 Number of elements = 325,484
We are studying the refined case for 3 different values of inlet velocity
Case-1: Inlet velocity = 1m/s
Residuals
Temperature contour cut plane:
Temperature contour:
Temperature contour processor:
Velocity contour:
Wall heat transfer coeffcient:
Case-2: velocity = 3m/s
Residuals:
Temperature contour cut plane:
Temperature contour:
Temperature contour processor:
Velocity contour:
Wall heat transfer coeffcient:
CAse-3: inet velocity = 5m/s
residuals:
Temperature contour cut plane:
Temperature contour:
Temperature contour processor:
Velocity contour:
Wall heat transfer coeffcient:
Summary:
Conclusion:
As the mesh is refined from 1st case to 2nd case, the values of temperature and heat transfer coefficient are decreasing with the same velocity.
As the velocity increases, the temperature decreases but the heat transfer coefficient reamains the same.